Ultrafast excited state dynamics of spirilloxanthin in solution and bound to core antenna complexes: identification of the S∗ and T1 states

Kosumi, D., Maruta, S., Horibe, T., Nagaoka, Y., Fujii, R., Sugisaki, M., Cogdell, R.J. and Hashimoto, H. (2012) Ultrafast excited state dynamics of spirilloxanthin in solution and bound to core antenna complexes: identification of the S∗ and T1 states. Journal of Chemical Physics, 137(6), 064505. (doi:10.1063/1.4737129)

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Abstract

Ultrafast excited state dynamics of spirilloxanthin in solution and bound to the light-harvesting core antenna complexes from Rhodospirillum rubrum S1 were investigated by means of femtosecond pump-probe spectroscopic measurements. The previously proposed S* state of spirilloxanthin was clearly observed both in solution and bound to the light-harvesting core antenna complexes, while the lowest triplet excited state appeared only with spirilloxanthin bound to the protein complexes. Ultrafast formation of triplet spirilloxanthin bound to the protein complexes was observed upon excitation of either spirilloxanthin or bacteriochlorophyll-a. The anomalous reaction of the ultrafast triplet formation is discussed in terms of ultrafast energy transfer between spirilloxanthin and bacteriochlorophyll-a.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Kosumi, D., Maruta, S., Horibe, T., Nagaoka, Y., Fujii, R., Sugisaki, M., Cogdell, R.J., and Hashimoto, H.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Journal of Chemical Physics
Publisher:American Institute of Physics
ISSN:0021-9606
ISSN (Online):1089-7690
Published Online:10 August 2012

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
502611Photosynthetic Antenna Research Center (PARC)Richard CogdellUS Department of Energy (DEN)2911085ARI MOLECULAR CELL & SYSTEMS BIOLOGY